ACDelco engine coolant temperature shut‑down switch 15-51107 (19189478) — OEM-fit, durable thermal control

ACDelco Gold 15-51107 (19189478) is an OEM-style engine coolant temperature shut‑down switch designed to monitor coolant temperature and trigger system shutdowns when factory thresholds are reached.

This ACDelco Gold temperature switch is a professional-grade aftermarket replacement built to match the original equipment’s fit and electrical characteristics for HVAC and engine thermal control circuits. It’s engineered to meet ACDelco’s standards for form, fit, and function so technicians and DIYers can restore proper operation to vehicles that use this switch without recalibrating wiring or mounting points.

How does this switch integrate with my vehicle’s HVAC and engine systems?

The switch mounts in the coolant circuit or sensor boss where the original engine coolant temperature shut‑down device was located. It completes or interrupts the factory control circuit based on coolant temperature, sending a clear on/off signal to the vehicle’s HVAC or engine shutdown control. Installation requires matching the connector and mounting thread to the original component.

• Direct OEM-compatible replacement for the listed part numbers
• Same thread size and mounting flange as factory unit
• Standard electrical connector footprint for plug-and-play installation

What performance and reliability features does the ACDelco Gold switch offer?

ACDelco Gold components are made to professional aftermarket standards that emphasize durability and consistent switching behavior. The unit is built with materials and internal contacts suited to repeated thermal cycles without drift, helping maintain the same switching thresholds the vehicle was designed for. It’s intended to provide predictable operation under typical engine bay conditions.

• Premium materials to withstand heat and coolant exposure
• Robust internal contacts for consistent electrical switching
• Manufactured to meet established fit, form, and function criteria

How do I know this is the correct part for my car?

Confirm fitment by comparing the part number (ACDelco Gold 15-51107 or OEM 19189478) to your vehicle’s parts list, service manual, or existing switch. Check physical attributes—thread pitch, connector type, and overall length—against the original switch. If those match and the part number aligns, this ACDelco unit is intended as a direct replacement.

• Verify part numbers: 15-51107 and OEM cross-reference 19189478
• Match electrical connector and thread dimensions to original switch
• Consult vehicle service documentation for location and replacement instructions

What should I expect during installation and maintenance?

Installation is straightforward for anyone comfortable working on cooling and electrical circuits: drain coolant as needed, remove the old switch, install the new unit with proper sealing, and reconnect the wiring harness. Use recommended thread sealant or washer per vehicle guidance and torque to spec. Periodic inspection of the connector and surrounding hose/clamp areas helps ensure long-term reliability.

• Drain coolant to a safe level before removal
• Use correct thread sealant or replacement sealing washer
• Tighten to vehicle manufacturer torque specifications

Who is this for: The ACDelco Gold 15-51107 (19189478) is aimed at professional technicians and informed DIY mechanics replacing a factory coolant temperature shut‑down switch or restoring HVAC/engine thermal control functionality. It’s suitable when you need an OEM-style replacement that matches original electrical and mounting characteristics without modifying vehicle wiring or controls.